Steam-boiler.



- 12. F. Dumm.

STEAM BOILER.

APPLICATION FILED PEB. 27, 1909. @49?95@ Patented Feb.22, 1910. 4 aSHEETS-SHEET 1.

lill| 11 Il R7? I LA i n VQ w w Wi 4 k B Y u I s vl l in l# 11 1 im w+ Nin l t \I l 1 1| k 1 Li 'I'. F. DOWNEY.

STEAM BOILER.

APPLICATION FILED 11:13.27, 1909.

Patented Feb. 22, 1910.

3 SHEETS-SHEET 2.

ANDREW sv GRAHAM C0.. PnowALnnuGRaPHFRs. wAsmNGToN. DAL

T. F. DOWNBY.

STEAM BOILER.

APPLIQATION FILED H1312?, 1909.

Patented Feb. 22, 1910.

3 SHEETS-SHEET 3.

ANDREW s. GRAHAM co., PHoTo-LITHOGRAPHERS. wsnmmou. DAC.

THOMAS F. DOWNEY, OF CHICAGO, ILLINOIS.

STEAM-BOIIER;

T o all whom it may concern:

Be it known that I, THOMAS F. DOWNEY, a citizen of the United States,residing at Chicago, inthe county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Steam Boilers, of whichthe following is a specification.

Certain features of this invention are es pecially applicable to Scotchor marine boilers. It has been common to place the grates within thelarge flues of boilers of this type, but with such an arrangement of thefurnace, the water in the bottom of the boiler is not sufficientlyheated and the circulation is poor. Furthermore, the grate surfaceavailable in the flues is limited. My invention contemplates placing thefurnace in front of the boiler and in communication with the large flueswhere the required amount of grate surface can be had and the water inthe boiler below the large flues can be more efficiently heated, therebyimproving the circulation. Where a construction of this kind has beenattempted in the past, there has been a serious loss of heat through thetop of the furnace.

It is one of the objects of this invention to provide such anarrangement o-f the boiler and the furnace as to avoid such loss ofheat, or rather, to utilize the heat from the arch or top wall of thefurnace.

As heretofore constructed, the arch has been made heavy enough tosupport itself, and consequently has restricted the space available fortubes or flues.

One of the objects of this invention is to utilize boiler tubes forsupporting the arch, whereby the latter can be made relatively light.

Another object of the invention is to make the side walls and the archindependent of one another, whereby the side walls may be removed orrenewed without disturbing the arch, and vice versa.

Another object of the invention is to iinprove the circulation in aScotch or marine boiler by combining water tubes therewith.

Another object of the invention is to provide simple and efficient meansfor superheating the steam. I

A further object of the invention is to provide such an arrangement ofthe furnace as shall promote the complete combustion of the fuel.

A further object is to provide means for Specification of LettersIatent.

Application filed February 27, 1909.

Patented Feb. 22, 1910.

serial No. 480,427.

warming the air admitted to the combustion chamber.

In the accompanying drawings, Figure l is a longitudinal central sectionthrough a steam boiler and furnace embodying the features of myinvention. Fig. 2 is a section on line 2 2 of Fig. 1. Fig. 3 is asection on line 3 3 of Fig. 1. Fig. 4 is a front elevation.

The embodiment of my invention which has been selected for illustrationcomprises a cylindrical forward section or shell 1 and a rearcylindrical section or shell 2. The section 2 is provided with a reartube sheet 3 and the forward tube sheet 4, the forward tube sheet havingtherein a circular opening surrounded by an annular flange 5 to whichflange the rear end of the shell 1 is secured. The upper portions of theshells or sections l and 2 are substantially alined. At the forward endof the shell 1 is a tube sheet 6. In the lower portion of the rear shell2 are two flues 7 of relatively large diameter. Extending from the tubesheet 6 of the forward shell 1 to the tube sheet 3 of the rear shell 2is a set of flues 8, said flues filling substantially the lower half ofthe shell 1 and providing a steam and water space a above them. Flues 9extend from the tube sheet 3 to the tube sheet 4 of the rear shell 2 ateach side of the flues S, the uppermost iues 9 being preferably in thesame plane as the uppermost flues 8. The rear ends of the flues 7, 8 and9 open into a chamber 10 of suitable construction aording an opportunityfor the products of combustion to pass from the flues 7 into flues 8 and9. A plurality of water tubes 11, preferably arranged in a plane, extendfrom the forward tube sheet 4 of the rear shell 2 to a water leg l2attached to the shell 1 near the forward end thereof and communicatinowith the interior of said shell 1. It will be understood that the tubes11 may be level or may pitch to the front or the rear.

The boiler is supported, in this instance, upon two piers 13 beneath therear shell 2 and two metal pillars 14 below the water leg 12. Brickwalls 15 extend from a point near the forward end of the shell 1 to theforward end of the shell 2, being connected at their forward ends by theboiler front 16 and at their rear ends by a wall 17. Said wall 17 coversthe lower portion of the tube sheet 4 and has openings therein alinedwith and of the same diameter as the fines 7. The water tubes 11 arepreferably inclosed within and support a tile arch 18 extending from oneof the side walls to the other. The wall 17 extends up to the arch 18.

The space at each side of the forward shell 1 is inclosed by asemicylindrical plate or casing 19 extending from one of the side wallsto the other, and from the tube sheet 4 to a point forward of the frontend of the shell 1. The forward end of the casing 19 is closed by walls20 and 21 to form a smoke box 22.

23 is a smoke flue communicating with the smoke box 22. Doors 24 may beprovided for the smoke box 22, if desired.

Any suitable form of grate may be employed. The bridge wall 25 extendsfrom one side wall 15 to the other at a suitable distance from the frontof the rear shell 2. Upon said bridge wall are two pillars 26 eachlocated in front of one of the flues 7 and serving to prevent theproducts of combustion from passing directly through the flues 7, saidpillars causing the smoke and hot gases to strike the wall 17. Thepillars 26 may be of triangular cross-section.

Suitable means may be employed for warming the air admitted to thecombustion chamber. I have herein shown a header 43 within the boilerfront, a suitable number of air-discharge tubes 44 communicating betweenthe header and the interior of the combustion chamber. Pipes 45 extendupward from the header 43, through the breeching 22, and merge into aninlet pipe or funnel 46.

In operation, the products of combustion pass over the bridge wall 25,through the fines 7 and the chamber 10 and through the ues 8 into thesmoke box 22 and out through the smoke flue 23. The products ofcombustion also pass through the fines 9 into the spaces Z) (Fig. 2)within the casing 19 at each side of the shell 1 and thence into thesmoke box 22. The hot gases in said spaces b serve to superheat thesteam in the steam space a.. The longer the section 1, the greater thedegree of superheat that may be obtained. The heat passing into the arch18 is utilized to heat the water in the tubes 11, the heat passingthrough the arch being radiated into the casing 19, where it serves toheat the water in the section 1 and to superheat the steam. As .will beunderstood, the pillars 26 and the facing 17 for the forward hood 4become highly heated and promote the combustion of the smoke.

When it becomes desirable to repair or replace the side walls 15, theymay be removed without disturbing the arch 18, since the latter issupported independently of the side walls.

Manholes and handholes of suitable construction may be provided at anydesired points in the boiler.

I would have it understood that I desire not to be limited to theprecise details of construction herein shown and described, for variousmodifications will occur to persons skilled in the art.

I claim as my invention:

1. The combination, with a Scotch boiler having a large iue in the lowerpart thereof and a plurality of small flues in the upper part thereof,of a furnace located in front of the lower part of the boiler andcommunicating with the large flue, a cylindrical shell extending fromthe upper part of the boiler to a position over said furnace, certain ofthe small fines being extended through said shell, a water leg at thefront end of said shell, a flat series of wat-er tubes connected attheir rear ends with the front tube sheet of the Scotch boiler abovesaid large iiue, said water tubes being connected at their front endswith said water leg, said tubes supporting the top wall of the furnace,means establishing communication between the rear ends of said fines,and a smoke outlet for the forward ends of said small flues.

2. The combination with a Scotch boiler having a large flue in the lowerpart thereof, of a furnace located in front of the lower part of theboiler and communicating with t-he large fine, a cylindrical shellextending from the upper part of the boiler to a position over saidfurnace, a water leg at the front end of said extension shell, a seriesof water tubes connected at their rear ends with the front tube sheet ofthe Scotch boiler above said large flue, said water tubes beingconnected at their front ends with said water leg, said tubes supportingthe top wall of the furnace, a plurality of small flues in said Scotchboiler located above said water tubes and arranged within said extensionshell and at each side of said shell, the flues within the shell beingextended to the forward end of the shell, means establishingcommunication between the rear ends of all of said flues, and a smokeoutlet for the forward ends of the small flues.

THOMAS F. DOVNEY. lVitnesses C. PAUL PARKER,

GEORGE L. CHINDAHL.

